I have spent literally 20-30 hours working to get artwork into Twonky. Each time I rescan (in Maintenance), one thing may get fixed, but three other things suddenly are broken (e.g., cover art duplicates itself inappropriately across multiple artists, for example, or artwork that was present before rescanning content is suddenly missing!) I have put album art into each folder identified as "folder.jpg". I then rescan in maintenance, save, and every so often restart the server and restart the computer. In several instances, the artwork just refuses to show up. All files are Flac. I quit using minim because after testing vs. Twonky, early indications were that Twonky was better at capturing artwork across all search types.